Belt-tightening idler.



PATENTED MAY 2'8, 1907.

G. S. DUNN. BELT TIGHTBNING IDLER.

APPLIOATION FILED SEPT.19,1906.

Inventor,

5270 '5. Dunn Witnesses s. Attorney llEW JERSEY, ASSIGNOR TO CltOCli'Elb DTP Specification Application filed ptember 19, 1906. Saris-1N0. 335,236,

To oiZZ whom it may concern.-

Be itlmown that l, Geno S. DUNN, a citizen oi the United States of America, and a resident of East Orange, county of Essex, and State of New Jersey, have invented certain new'and useful improvements in Bel Tightening' Idlers, of which the following is as ecification.

he object of the invention is to provide a belt tightening idler which is particularly applicable in connection with electric motors wherever the limited center distances I between pulleys require an increased belt contact on the pulley surfsces.

is a hirther object, and, to

' The device is constructed for convenient attachment to the frame surrounding the bearing of the motor shaft which adjoins the driving pulley of the motor. For appliccr tion to a motor such as is illustrated, the construction is such that no modification need be introducedv into the construction of the motor itself. Simplicity of construction and adaptability. without substitution of parts to any direction of lead-oil and lead-"on of thcbelt, and to either direction of rotation, J. end, the belt in htenrn idler is constructed oi a small 9 number orlight and inexpensive parts which 'nia be' assembled in different wa s with respect toeach other, and att o i to the motor in various relations to eacn o ther and the motor, at the points where provision regularlymade for receiving bolts which holdto'gethcr the parts of the motor.

In the accompanying sheet drawings, which form a cart of this application, Fig ure 1 is an on I View of a motor with belt tightening idler embodying my invention attached thereto. Fig. 2 is a side view of the motor at the end with the driving pulley and showing the belt tighten fr idler.

The belt tightening idlcr, :1

illustrated, comprises preferably an idler pulley}, an arm or piyoted support A and stud-yoke or plate Y.- The SlilldfYOliG is drilled at about its middle point to receive bolt h, by which it may be attached to the irame of motor.

The stud-yoke may be attached. at either one of a plurality of points equally spaced, there being usually four points on the motor which are equidistant from the axis of the motor and at .i'uluety degrees angular spacing Letters Patent.

PlilTlllNT oninon,

NEW JERSEY, A CORPOFATIQN OF N EDLEWH Patented May 28, 1907.

around the driving pulley D and supportingtor illustrated for securing together the magnet-frame M and the rear end-shield or endhead E which. supports the armature shalt bearing next to the pulley. The stud-yoke bears at its ends against the side of the flange of the end-shield and also overhangs the edge of the end-shield which it fits closely. It is therefore seated firmly and securely held by a single bolt which. also passes through the end hcad into the frame. Tapholes h h are provided in either of which a stud pmey be set which serves as a hinge pin for the idler arm. These holes are lo cated so as to be equidistant from the axis of the driving pulley and at an angular s acing which is preferably a subdivision of tne'angular spacing of the points of attachment for the stud-yoke on the motor frame. In the stud-yokc as illustrated, two such holes are provided at forty-five degrees spacing, which is half the spacing of the points of attachment of the yoke to the inotor frame. -A.s the yoke can be placed. either of the four points of attachment, in

full line and in the other two of which the yoke is indici-ited in dotted lines, there is choice of as many connection points for the idler arm with equidistant spacing around the driving pulley as the product of the number of points of attachment for the stud-yoke by the number of connection points for the idler arm on the stud-yoke.

A. tension spring T is provided for drawing the pulley against the slack side of the belt, connection being made between one end of a screw on which the idler pulley is journaled and en anchorage point p which is preferably a screw which may be set in either'of two holes 7L h in an anchor-yoke Y similar to the stud -yoke which supports the idler arm, whereby as many anchorage points for the ring spaced around the driving pulley irl'orded as there are connection points 1' the idler arm. The tension of the spring is regulated and the normal distance between idler pulley is made adjustable by providing a heel; screw V which 18 engsgcd by aicw closely wound oonvolntlons at one end or the e anchorage point and the journal of the,

spring. "A hook t is provided on the other end of the spring. A loop Z at the end of the hook screw serves as a handle for the screw.

In setting up the belt-tightening idler for any required lead-on of the belt to the pulley, the idler is placed against the slack side in about the desired position; the idler arm is brought to the side of the pulley shown if the rotation of the driving pulley is to be clockwise, and if the rotation is to be counterclockwise the arm is brought to the opposite side. Then the stud-yoke is placed at the point of attachment to the motor which will brin a connection point of the yoke most near ly to the hinge end. of the idler arm, and the stud which serves as the hinge pin is passedthrough the idler arm and screwed into the yoke. If after trial it appears that the most advantageous position for the idler pulley has not been found, the stud bolt may be unscrewed and put in the other hole in the block, and the block can be moved to the next position on the frame. The anchoryoke is then placed either ninety degrees from or opposite to the other yoke so as to bring a hole for the anchor pin one hundred. and thirty-five degrees forward from the stud for the idler arm if the direction of rotation is as indicated; for the opposite direction of rotation the anchor pin should be one hundred and thirty-five degrees on the other side of the stud for the idler arm. More or less spacing than this may sometimes be desirable, but with the parts proportioned as shown, this spacing will usually be what is required. The tension spring with its hook screw is then set in place, one hook engaging the anchor pin and the other hook engaging the end of the journal pin of the idler pulley. The hook formed on the hook screw is hooked upon whichever pin will bring the handle of the screw in the most convenient position for adjustment. Adjustment is afforded for the tension on the belt and taking up of slack by screwing the hook-screw in or out of the spring, the hook-screw being first unhooked from the journal pin or anchor pin.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. The combination of a pulley, a supporting shaft, a frame surrounding the shaft with angularly "spaced points of attachment, an idler pulley, an arm for the support of the idler pulley, a yoke with a plurality of connection poi'nts for the arm, and a tension device applied to the arm, substantially as de scribed 2. The combination of a pulley, a support ing shaft, a frame surrounding the shaft with angularly spaced points of attachment, an'

idler pulley, an arm for the support of the idler pulley, and a yoke with a plurality of connection points for the arm with different angular ,spacing from the spac ng of thepoints of attachment of the yoke to the frame, substantially as described.

3. The combination of a pulley, a supporting shaft, a frame surrounding the shaft with angularly spaced points of attachment, an idler pulley, an arm for the support of the idler pulley, a yoke with a plurality of connection points for the arm, a tension spring for the idler arm and an anchor pin adapted to be attached at the connection points pro-.

vided for the arm, substantially as described.

4. The combination of a pulley, a supporting shaft, a frame surrounding the shaft with angularly spaced points of attachment, an idler pulley, an arm for the support of the idler pulley, a stud-yoke with a plurality of connection points for the arm, a tension spring for the idler arm, and an anchor-yoke with a plurality of anchor points for the tension spring, substantially as described.

5. In a belt tightening idler, the combination of a pulley, a shaft, a supporting frame, an idler pulley, an idler arm, and an adjustable tension device connected between the idler arm and the supporting frame, the tension device consisting of a tension spring and a hook-screw engaging convolutions at one end of the tension spring, substantially as described.

6. In combination, an electric motor having a frame and an end-head, a plurality of equally spaced bolts for attaching said endhead to said frame, a belt-tightener comprismg an idler-pulley, a pivoted support for said pulley, and a plate on which said support is mounted, said plate being mounted on a bolt passing through the enll-head into the frame, substantially as described.

Signed by me at Ampere, N. J this 14 day of September, 1906.

- GANO S. DUNN. Witnesses:

H. O. HARRISON, H. J. FULLER.

IOC 

